My chevy caprice classic 1994 4.3 v8 I just recently change the a/c low pressure switch because the old one was leaking and the new one I just installed and with new O ring gasket also is leaking i

SOURCE: 91 chevy caprice classic, engine hesitates

Check your fuel filter and air filter. That is usually where your hesitation starts.

SOURCE: 1995 chevy caprice classic

Try replacing your fuel pump relay, Its common on chevys.Those fuel pumps are too expensive to keep replacing

SOURCE: 1994 chevy 5.7liter v8 truck 2 wheel drive

I would start by checking spark modulator under the distributor not the cap but the distributor. two sets of wires from under distributor thats it remove dis cap 2small screws on drivers side removes it . You can take to checker or autozone they will check it for you hope this is it later good luck

SOURCE: How to install a new fuel pump on a 1985 Chevy,305 V8,

Remove the plunger rod by removing the plate that is bolted to the block. Clean all parts if needed.

Apply some axle grease to the plunger rod and reinstall into the block, replace plate, then carefully install fuel pump, making sure the plunger is under the push rod.

Just did this same thing on my '66 283.

SOURCE: My car hesitates on acceleration from a stop.

Sounds like a bad wire connection. Check the connectors for cleanliness and that they are tight and free of corrosion.

Testimonial: "Good idea. I intend to replace spark plugs, wires and distributor cap. Car just turned over 100,000 miles. Which wires should I check in addition?"